Final answer:
A Muslim can ensure his future happiness by observing the Five Pillars of Islam: Shahadah, Salat, Sawm during Ramadan, Zakat, and Hajj, along with leading a life of piety, cleanliness, and community service.
Step-by-step explanation:
A Muslim can ensure his future happiness by faithfully observing the Five Pillars of Islam, which are central to the Islamic faith. These pillars serve as a framework for a Muslim's life and include Shahadah (the declaration of faith), Salat (prayer five times a day), Sawm during the month of Ramadan (fasting), Zakat (charitable giving), and the Hajj (pilgrimage to Mecca). By adhering to these pillars, a Muslim fulfills his religious duties and seeks to live a life in accordance with God's will, which in turn is believed to lead to happiness in this life and hereafter.
Alongside these religious practices, leading a life of piety, engaging in community services, and maintaining personal cleanliness and hygiene, such as wearing clean garments on Fridays, also contribute to ensuring one's future happiness. It is taught that every action taken with good intentions, such as learning the Quran by heart or building places of worship, will bring rewards from God. This holistic approach combines religious observance with moral conduct and social responsibility.